I changed the level map name whilst in Unreal and now its broken? Uni Assignment level due in 4 DAYS

So I am working on my uni assignment level which I have done all this year. I have always kept saving the level and obviously it auto saves. I changed the level name from ThirdPersonExampleMap to Main Level whilst in the engine and hit save. This became an issue and will not now load. I tried checking the back log for an auto save and it was dated 5 months ago. I still have files of the map which i try loading but this does not have all the maps assets like buildings or characters within the map. I really could do with help here to try and rescue this projects its due in 4 days time! The files you can see in the photo are the ones from the last save which the game was working but the first error message is what i get when opening the level.